Suppress some exciting new warnings

Change-Id: I0744cfcfdef834db644674fe1afa967118b8627c
Reviewed-on: https://fuchsia-review.googlesource.com/c/fargo/+/635647
Reviewed-by: Ben Lawson <benlawson@google.com>
diff --git a/src/command_line.rs b/src/command_line.rs
index 0706d28..9255305 100644
--- a/src/command_line.rs
+++ b/src/command_line.rs
@@ -151,6 +151,7 @@
 }
 
 #[derive(Debug, StructOpt)]
+#[allow(unused)]
 struct MakePackage {
     /// Path to the binary to package
     #[structopt(long)]
@@ -182,6 +183,7 @@
 
     /// Use run to run the binary.
     #[structopt(long)]
+    #[allow(unused)]
     run_with_run: bool,
 
     /// Use tiles_ctl add to run the binary.
@@ -243,6 +245,7 @@
     // command that includes "--run-with-run", but some fargo commands also
     // append their own "--run-with-run" when calling fargo recursively.
     #[structopt(long, multiple = true)]
+    #[allow(unused)]
     run_with_run: bool,
 
     /// Use tiles_ctl add to run the binary.
@@ -320,6 +323,7 @@
 
     /// Use run to run the test.
     #[structopt(long)]
+    #[allow(unused)]
     run_with_run: bool,
 
     #[structopt(long)]